Four doughnuts and 4 coffees cost $12. The cost of the 4 coffees is half the cost of the 4 doughnuts. What is the cost of each c
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We essentially have a ratio here:
Since we know the ratio is going to stay constant at
, we can use this to find the height of the lamp along with the information that the total distance from the lamp to the tip of his shadow is 20:
Since we know the ratio is going to stay constant at